Diagrams - Sony CFM-A50 Service Manual

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Tape Speed Adjustment
Procedure :
1. Mode : Playback (Normal Speed)
speed checker
LFM-30 or
test tape
digital frequency
WS-48B
counter
(3kHz, 0dB)
32 Ω
set
J101 (Earphone jack)
2. Adjust RV103 so becomes the adjustment value below.
3. Set to slow playback switch (S105) ON mode.
Confirm that the become adjustment value as to follows.
Adjustment Value :
Speed checker
Digital frequency counter
–1 to +1%
2,970 – 3,030Hz
Frequency difference between the beginning and the end of the tape
should be within 1.5% (45Hz).
Adjustment Location :
[DECK CONTROL BOARD]
(Component side)
RV103 : Tape speed Adjustment
– 9 –
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AEP, UK model
TUNER SECTION
AM Section
Function switch : RADIO
Band switch
: AM (US model)
MW or LW (AEP, UK model)
Volume
: MIN
AM RF signal
Put the lead-wire
generator
antenna close to
the set.
Adjustment Location : MAIN board (Component side)
30% amplitude modulation by 400Hz
signal.
AEP, UK model
Output level : as low as possible
level meter
32 Ω
set
CT5 : LW Tracking Adjustment
J101 (Earphone jack)
CT1–4 : FM Frequency
FM Section
Function switch : RADIO
Band switch
: FM
Volume
: MIN
CT6 : LW Frequency
FM RF signal
generator
L3 : MW Frequency Coverage Adjustment
0.01 µ F
telescopic
antenna
terminal
22.5kHz frequency deviation by
400Hz signal.
Output level : as low as possible
level meter
32 Ω
US model
set
J101 (Earphone jack)
• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
(
) : AEP, UK only
AM IF ALIGNMENT
Adjust for a maximum reading on level meter.
T1
455kHz
AM (MW) FREQUENCY COVERAGE ADJUSTMENT
L3 : AM Frequency Coverage Adjustment
Adjust for a maximum reading on level meter.
L3
520kHz
CT1 – 2
1,780kHz
(1,680kHz)
AM (MW) TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L6 (L6 – 1)
620kHz
CT1 – 1
1,400kHz
manuals search engine
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
LW FREQUENCY COVERAGE ADJUSTMENT
L2
Adjust for a maximum reading on level meter.
CT1 – 4
L4
145kHz
CT6
300kHz
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
LW TRACKING ADJUSTMENT
L1
Adjust for a maximum reading on level meter.
CT1 – 3
L6 – 2
145kHz
CT5
300kHz
[MAIN BOARD] (Component side)
L6–2: LW Tracking Adjustment
L6–1: MW Tracking Adjustment
T1 : AM IF Alignment
Coverage Adjustment
L4 : LW Frequency
Coverage Adjustment
Coverage Adjustment
L1 : FM Tracking Adjustment
CT1–3 : FM Tracking Adjustment
CT1–2 : MW Frequency Coverage Adjustment
CT1–1 : MW Tracking Adjustment
[MAIN BOARD] (Component side)
L6 : AM Tracking Adjustment
T1 : AM IF Alignment
CT1–4 : FM Frequency
Coverage Adjustment
L1 : FM Tracking Adjustment
CT1–3 : FM Tracking Adjustment
CT1–2 : AM Frequency Coverage Adjustment
CT1–1 : AM Tracking Adjustment
– 10 –
CIRCUIT BOARDS LOCATION
r
86.5MHz
(87MHz)
109.5MHz (108.30MHz)
H/P JACK board
86.5MHz
(87MHz)
109.5MHz (108.30MHz)
TUN LED board
L2 : FM Frequency Coverage Adjustment
POWER board
L2 : FM Frequency Coverage Adjustment
SECTION 5

DIAGRAMS

TACT SW board
DECK CONTROL board
BATTERY board
MAIN board
VOLUME board
ISS SW board
(AEP, UK model)
– 11 –

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